|
| US4348672 | 4 mars 1981 | 7 sept. 1982 | Tele-Drill, Inc. | Insulated drill collar gap sub assembly for a toroidal coupled telemetry system |
| US4423778 | 28 sept. 1981 | 3 janv. 1984 | Baker International Corporation | Concentric tubing separation joint |
| US4428443 | 21 sept. 1981 | 31 janv. 1984 | Stability Drilling Systems, Inc. | Shock absorbing tool for connection to a drill column |
| US4551947 | 25 juil. 1983 | 12 nov. 1985 | Maschinenfabrik Gehring Gesellschaft mit beschrankter Haftung & Co. Kommanditgesellschaft | Device for honing workpieces |
| US4560012 | 9 oct. 1984 | 24 déc. 1985 | | Drill collar structure for use in deviated well bore drilling |
| US4693317 | 3 juin 1985 | 15 sept. 1987 | Halliburton Company | Method and apparatus for absorbing shock |
| US4759430 | 22 déc. 1986 | 26 juil. 1988 | Werkzeugmaschinen-fabrik Oerlikon-Buhrle AG | Energy absorbing arrangements |
| US4909361 | 13 oct. 1988 | 20 mars 1990 | Arrow Paper Products Company | Drive shaft damper |
| US5117911 | 16 avr. 1991 | 2 juin 1992 | Jet Research Center, Inc. | Shock attenuating apparatus and method |
| US5328408 | 30 juin 1992 | 12 juil. 1994 | WOCO Franz-Josef Wolf & Co. | Shaft absorber |
| US5976021 | 14 juil. 1997 | 2 nov. 1999 | Arrow Paper Products, Co. | Drive shaft damper |
| US6039118 | 1 mai 1997 | 21 mars 2000 | Weatherford/Lamb, Inc. | Wellbore tool movement control and method of controlling a wellbore tool |
| US6070670 | 1 avr. 1998 | 6 juin 2000 | Weatherford/Lamb, Inc. | Movement control system for wellbore apparatus and method of controlling a wellbore tool |
| US7080699 | 29 janv. 2004 | 25 juil. 2006 | Schlumberger Technology Corporation | Wellbore communication system |
| US7591327 | 30 mars 2007 | 22 sept. 2009 | | Drilling at a resonant frequency |
| US7880640 | 24 mai 2006 | 1 févr. 2011 | Schlumberger Technology Corporation | Wellbore communication system |
